Selective laser sintering (SLS) is an additive manufacturing process that builds three dimensional parts layer by layer by fusing a powder. A high power laser follows a tool path to fuse the powder and produce the 3D part. This work develops a prototype SLS system which will be used to improve SLS-fabricated part quality in terms of porosity and surface roughness. First the prototype SLS system is designed for laboratory use. Design parameters include layer thickness, forward step size, side step size, laser power, and laser spot size at the powder bed. Porosity and surface roughness are estimated for sample parts representative of SLS applications.